Balraj Khanna: Lines of Flight review – plenty of dazzle, but where is the darkness?

<p><strong>Ikon, Birmingham</strong><br>This six-decade survey is a riot of biomorphic blobs, candy-coloured galaxies and cosmic spectacle – but the quieter works pack the biggest punch</p><p>The work of Balraj Khanna will be familiar to many residents of Birmingh